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Hello. In this exercise we are

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going to learn something new about the

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usb. The usb is the

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wire we use to connect the arduino

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board to the computer

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so we already know that we can

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use this wire to program the arduino

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board from the computer and we also

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know that we can use this connector

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to provide energy from the computer but

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there is another possibility we can use

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this connector to send and receive information

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from the computer to the arduino board

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and vice versa from the hardware

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aboard to the computer

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so in this exercise here we have

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the arduino board we have the

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protoboard

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and we have the voltage divider now

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the idea is really simple we already

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know how to read an analog value

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using a zero and the voltage divider

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so we are going to program the

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circuit this way so let me show

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you the code

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we are reading the analog pen or

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connector a zero we store it in

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a variable called a

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and that the new block is the

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second one this blue one

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you will find it here at the

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top in the blue library

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and it's this blog called print series

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monitor and the interesting thing here is

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that we are going to print a

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okay so then we have this weight

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block

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and so what is what is this

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blue one mean while the series monitor

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is a tool the computer has to

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receive information from the arduino board

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so here in the simulator

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the series monitor is down here so

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when we start the simulation down here

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we will be reading values ok the

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values that are coming from a zero

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if i move the divider closer to

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five volts to one thousand twenty three

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you can see that the values become

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higher

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if we move move it closer to

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zero toward the left it becomes lower

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but using the simulator here doesn't give

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you the whole idea about the program

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so I am going to take this

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code

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and we can stop the simulation

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so just the code I'm going to

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take the text right and copy and

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paste it

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into the arduino id the program you've

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already seen that so I paste it

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here and check it up here

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and it works fine and then we'll

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upload this to the arduino board because

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my arduino board on the screen is

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connected to the computer through the usb

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wire that is back here can you

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see it

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so I'm going to send this program

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the one that we programmed with the

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blocks to the arduino

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so we will read from a zero

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this one and we will also have

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the five volts and the ground

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so the arduino board will read the

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information sent by a zero so I

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will send it or click upload and

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now it works

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now the series monitor in this program

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can be found up here if we

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click on tools and then down to

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series monitor

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let's just make it a little bit

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smaller

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so right now we're reading seven hundred

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sixty six

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if I turn this real voltage divider

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higher and move it a little bit

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to the left or even all the

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way it'll go to the maximum value

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it'll read the highest if I move

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it to the to the right it

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becomes lower and lower

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and it's reading lower so this is

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really interesting because we are taking this

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electronic component and the value is sent

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using the usb here and sending it

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to the computer and the computer can

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read it

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so this is the amazing thing about

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this exercise

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so for now let's just leave this

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simulation here and go back to the

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circuit this is the exercise you have

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to do you are going to copy

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this voltage divider so place another one

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next to it for instance with the

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ground connected to the ground the five

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volts wire connected to the five volts

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and

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here instead of connecting to a zero

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which is already being used you're going

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to connect to a one so you

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will read two values and so the

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same way you're reading one value in

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the code you will read another one

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in another variable for instance you can

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make it be

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and you will send both values to

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the series monitor with a and then

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again with b

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then you await one second because it

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means you read and wait one second

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until the next one starts reading

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and then you will also use the

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if block to compare like we've done

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now there will be three possibilities if

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a is higher than b

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and you will use the blue block

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to say if a is

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higher than b

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and another one for if they are

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equal so if a equals b and

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you will send with the blue block

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a equals b

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and the third one if b is

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higher than a

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you will send that to the series

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monitor with blue if b is higher

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than a so you will complete this

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exercise with another variable and you will

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check three conditions and you will also

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send the three conditions to the usb

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connector and series monitor okay that is

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all for this

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exercise good luck